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<head><meta charset="utf-8"><title>Closures · wg-traits · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/index.html">wg-traits</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html">Closures</a></h3>

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<a name="199774552"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199774552" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199774552">(Jun 04 2020 at 16:38)</a>:</h4>
<p>So I started to implement closures: <a href="https://github.com/rust-lang/chalk/compare/master...jackh726:closure">https://github.com/rust-lang/chalk/compare/master...jackh726:closure</a></p>



<a name="199774608"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199774608" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199774608">(Jun 04 2020 at 16:39)</a>:</h4>
<p>I assumed we just wanted to pass the whole closure substs</p>



<a name="199774766"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199774766" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199774766">(Jun 04 2020 at 16:40)</a>:</h4>
<p><span class="user-mention" data-user-id="230601">@Nathan Whitaker</span> ^</p>



<a name="199782116"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199782116" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Florian Diebold <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199782116">(Jun 04 2020 at 17:31)</a>:</h4>
<p>IIRC closures in rustc have this weird/funny thing where they use an integer type in the subst to keep track of the closure kind, I wonder whether Chalk should adopt that (but I don't really have a better idea)</p>



<a name="199782262"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199782262" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199782262">(Jun 04 2020 at 17:32)</a>:</h4>
<p>Indeed</p>



<a name="199782312"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199782312" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199782312">(Jun 04 2020 at 17:33)</a>:</h4>
<p>the docs here are quite helpful: <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.ClosureSubsts.html">https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.ClosureSubsts.html</a></p>



<a name="199782385"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199782385" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199782385">(Jun 04 2020 at 17:33)</a>:</h4>
<p>I'm thinking that Chalk should just have a function in <code>RustIrDatabase</code> for <code>ClosureKind</code></p>



<a name="199782804"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199782804" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199782804">(Jun 04 2020 at 17:36)</a>:</h4>
<p>In my WIP branch, for the upvar tys (for Copy/Clone), I just pick the last parameter and assume its a tuple. Basically matching rustc's behavior</p>



<a name="199782849"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199782849" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199782849">(Jun 04 2020 at 17:37)</a>:</h4>
<p>But I'm also wondering if it's more worth it to make this also completely opaque from Chalk's perspective</p>



<a name="199782989"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199782989" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199782989">(Jun 04 2020 at 17:38)</a>:</h4>
<p>So <code>RustIrDatabase</code> would have a <code>closure_kind</code>, <code>closure_upvars</code>, and then probably a <code>closure_as_fn_ptr</code></p>



<a name="199783095"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199783095" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199783095">(Jun 04 2020 at 17:39)</a>:</h4>
<p>Really makes me wish we just pushed a basic version of <a href="https://github.com/rust-lang/chalk/pull/475">https://github.com/rust-lang/chalk/pull/475</a> through</p>



<a name="199816274"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199816274" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Nathan Whitaker <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199816274">(Jun 04 2020 at 22:25)</a>:</h4>
<p>I think passing the whole closure substs should work.</p>



<a name="199816386"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199816386" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Nathan Whitaker <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199816386">(Jun 04 2020 at 22:26)</a>:</h4>
<p>I had a branch starting on this, and kind of ran into the same design question: how much knowledge chalk should have about the specifics of closures</p>



<a name="199816409"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199816409" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199816409">(Jun 04 2020 at 22:26)</a>:</h4>
<p>Well, the substs themselves can be opaque to Chalk</p>



<a name="199816442"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199816442" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199816442">(Jun 04 2020 at 22:27)</a>:</h4>
<p>or</p>



<a name="199816449"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199816449" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199816449">(Jun 04 2020 at 22:27)</a>:</h4>
<p>I guess, the <em>meaning</em> of the substs</p>



<a name="199816698"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199816698" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Nathan Whitaker <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199816698">(Jun 04 2020 at 22:30)</a>:</h4>
<p>Yeah that makes sense</p>



<a name="199816763"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199816763" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Nathan Whitaker <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199816763">(Jun 04 2020 at 22:31)</a>:</h4>
<p>I also find myself wondering if we really <em>need</em> knowledge about the upvar types, since as far as I know they're only used to determine which of the Fn traits are implemented by the closure</p>



<a name="199816798"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199816798" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Nathan Whitaker <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199816798">(Jun 04 2020 at 22:31)</a>:</h4>
<p>Which is presumably already known by rustc (since the closure kind is determined in typechecking )</p>



<a name="199817511"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199817511" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Nathan Whitaker <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199817511">(Jun 04 2020 at 22:40)</a>:</h4>
<p><span class="user-mention silent" data-user-id="232957">Jack Huey</span> <a href="#narrow/stream/144729-wg-traits/topic/Closures/near/199783095">said</a>:</p>
<blockquote>
<p>Really makes me wish we just pushed a basic version of <a href="https://github.com/rust-lang/chalk/pull/475">https://github.com/rust-lang/chalk/pull/475</a> through</p>
</blockquote>
<p>I agree, I've been meaning to get around to reworking that PR so we at least have <em>something</em>. I should probably be able to get a PR  up in the next week or so, but someone else can pick it up if they're looking for something to work on right now.</p>



<a name="199817898"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/199817898" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#199817898">(Jun 04 2020 at 22:45)</a>:</h4>
<p>I've been hacking at it a bit :)</p>



<a name="200716350"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200716350" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200716350">(Jun 12 2020 at 19:46)</a>:</h4>
<p><span class="user-mention" data-user-id="232957">@Jack Huey</span> <a href="https://github.com/rust-lang/chalk/pull/519#pullrequestreview-429990566">left comments on your PR</a></p>



<a name="200716538"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200716538" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200716538">(Jun 12 2020 at 19:48)</a>:</h4>
<p>Thanks :) I'll take a look</p>



<a name="200716549"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200716549" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200716549">(Jun 12 2020 at 19:48)</a>:</h4>
<p>Something seems weird with CI</p>



<a name="200716570"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200716570" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200716570">(Jun 12 2020 at 19:48)</a>:</h4>
<div class="codehilite"><pre><span></span><code>  Downloaded lalrpop v0.19.0
error: failed to parse manifest at `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/lalrpop-0.19.0/Cargo.toml`

Caused by:
  readme file with name &#39;../README.md&#39; was not found
</code></pre></div>



<a name="200727914"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200727914" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200727914">(Jun 12 2020 at 21:44)</a>:</h4>
<p>....</p>



<a name="200728442"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728442" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728442">(Jun 12 2020 at 21:52)</a>:</h4>
<p>yeah, i'm seeing that too wtf.</p>



<a name="200728523"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728523" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728523">(Jun 12 2020 at 21:52)</a>:</h4>
<p>that doesn't appear to be a new version of lalrpop</p>



<a name="200728530"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728530" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728530">(Jun 12 2020 at 21:52)</a>:</h4>
<p>at least, it's the same one <em>I</em> have in my cargo.lock</p>



<a name="200728531"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728531" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728531">(Jun 12 2020 at 21:52)</a>:</h4>
<p>it is not</p>



<a name="200728534"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728534" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728534">(Jun 12 2020 at 21:53)</a>:</h4>
<p>(new)</p>



<a name="200728539"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728539" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728539">(Jun 12 2020 at 21:53)</a>:</h4>
<p>I checked</p>



<a name="200728573"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728573" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728573">(Jun 12 2020 at 21:53)</a>:</h4>
<p>could be a bug in nightly cargo</p>



<a name="200728574"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728574" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728574">(Jun 12 2020 at 21:53)</a>:</h4>
<p>wonder if it's related to the failures I was seeing in the rust repo</p>



<a name="200728578"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728578" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728578">(Jun 12 2020 at 21:53)</a>:</h4>
<p>I haven't updated nightly in a while</p>



<a name="200728586"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728586" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728586">(Jun 12 2020 at 21:53)</a>:</h4>
<p>I'm not even sure if I'm <em>using</em> nightly</p>



<a name="200728648"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728648" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728648">(Jun 12 2020 at 21:54)</a>:</h4>
<p>ah the glories of building on stable... "what version of rustc are you using"... "got me"</p>



<a name="200728705"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728705" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728705">(Jun 12 2020 at 21:55)</a>:</h4>
<p>that said, after updating nightly, things still seem to build for me</p>



<a name="200728724"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728724" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728724">(Jun 12 2020 at 21:55)</a>:</h4>
<p>is that locally?</p>



<a name="200728731"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728731" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728731">(Jun 12 2020 at 21:55)</a>:</h4>
<p>yes</p>



<a name="200728746"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728746" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728746">(Jun 12 2020 at 21:55)</a>:</h4>
<p><a href="https://github.com/rust-lang/cargo/issues/8354">https://github.com/rust-lang/cargo/issues/8354</a></p>



<a name="200728817"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728817" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728817">(Jun 12 2020 at 21:56)</a>:</h4>
<p>sure looks like that issue then</p>



<a name="200728865"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728865" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728865">(Jun 12 2020 at 21:56)</a>:</h4>
<p>How unfortunate</p>



<a name="200728895"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728895" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728895">(Jun 12 2020 at 21:57)</a>:</h4>
<p>Anyways, we can merge the version upgrade now, since it's 100% going to pass CI</p>



<a name="200728915"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200728915" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jack Huey <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200728915">(Jun 12 2020 at 21:57)</a>:</h4>
<p>or I can just retry tomorrow and merge on green</p>



<a name="200729002"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Closures/near/200729002" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Closures.html#200729002">(Jun 12 2020 at 21:58)</a>:</h4>
<p>yeah merge it</p>



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